Vane pump

ABSTRACT

A vane pump is provided with: a pump housing having an accommodating concave portion; and a pump cartridge accommodated in the accommodating concave portion, wherein the pump cartridge has: a rotor; a plurality of vanes received in a plurality of slits formed in the rotor; a cam ring formed with a cam face on an inner circumference of the cam ring; and a first side plate provided at the opposite side from a bottom surface of the accommodating concave portion such that the cam ring is located therebetween, the first side plate has a first projected portion projected radially outward, and the pump cartridge is anchored to the pump housing via the first projected portion.

TECHNICAL FIELD

The present invention relates to a vane pump.

BACKGROUND ART

JP2018-80687A discloses a vane pump provided with a pump housing havingan accommodating concave portion and a pump cartridge that isaccommodated in the accommodating concave portion. The vane pumpdescribed in JP2018-80687A is attached to an electric motor that is adriving source.

SUMMARY OF INVENTION

In the vane pump described in JP2018-80687A, the pump cartridge is fixedby assembling the pump housing to the electric motor. Therefore, inorder to prevent the pump cartridge from being detached from the pumphousing until the vane pump is assembled to the electric motor, it isrequired to assemble an anti-detachment member, such as a cover plate,etc. covering the pump cartridge, to the pump housing.

On the other hand, the anti-detachment member needs to be disassembledfrom the pump housing when the vane pump is to be assembled to theelectric motor. As described above, because steps of assembling anddisassembling the anti-detachment member to/from the pump housing arerequired, the number of man-hours is increased, and as a result, thereis a concern that a manufacturing cost of an apparatus having the vanepump is increased.

An object of the present invention is to reduce a manufacturing cost ofan apparatus having a vane pump.

According to one aspect of the present invention, a vane pump configuredto discharge working fluid by being rotationally driven by a drivingsource, includes: a pump housing having an accommodating concaveportion; and a pump cartridge accommodated in the accommodating concaveportion. The pump cartridge has: a rotor to which a rotational drivingforce from the driving source is transmitted; a plurality of vanesfreely slidably received in a plurality of slits, the slits being formedin the rotor in a radiating pattern; a cam ring formed with a cam faceon an inner circumference of the cam ring, the cam face being configuredsuch that tip ends of the plurality of vanes slide on the cam face asthe rotor is rotated; and a first side plate provided on an oppositeside from a bottom surface of the accommodating concave portion suchthat the cam ring is located therebetween. The first side plate has afirst projected portion projected radially outward, and the pumpcartridge is anchored to the pump housing via the first projectedportion.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a sectional view of a vane pump according to a firstembodiment of the present invention.

FIG. 2 is a sectional view of the vane pump taken along a line II-II inFIG. 1.

FIG. 3 is an enlarged sectional view of the vane pump taken along a lineIII-III in FIG. 2.

FIG. 4 is a sectional view of the vane pump according to a secondembodiment of the present invention.

FIG. 5 is a sectional view of the vane pump taken along a line V-V inFIG. 4.

FIG. 6 is an enlarged sectional view of the vane pump taken along a lineVI-VI in FIG. 5.

FIG. 7 is a sectional view of a modification of the vane pump accordingto respective embodiments of the present invention.

DESCRIPTION OF EMBODIMENTS

In the following, embodiments of the present invention will be describedwith reference to the drawings.

First Embodiment

A vane pump 100 according to a first embodiment of the present inventionwill be described with reference to FIGS. 1 to 3. FIG. 1 is a sectionalview showing a state in which the vane pump 100 according to the firstembodiment of the present invention is assembled to a driving source 50,FIG. 2 is a sectional view showing a cross-section taken along a lineII-II in FIG. 1, and FIG. 3 is an enlarged sectional view showing across-section, in enlargement, taken along a line III-III in FIG. 2.

The vane pump 100 is used as a fluid pressure source for a fluidhydraulic apparatus, such as, for example, a power steering apparatus, acontinuously variable transmission, or the like, mounted on a vehicle.Oil, aqueous alternative fluid of other type, or the like may be used asworking fluid. As the driving source 50 for driving the vane pump 100,an engine or an electric motor (not shown) is used.

As shown in FIGS. 1 and 2, the vane pump 100 is provided with a pumphousing 10 having an accommodating concave portion 11 and a pumpcartridge 20 that is accommodated in the accommodating concave portion11.

The pump housing 10 has an attachment surface 10 a that is attached toan attachment surface 52 a of a housing 52 of the driving source 50 andthe accommodating concave portion 11 that opens at the attachmentsurface 10 a. The accommodating concave portion 11 is a recessed spacehaving a bottom surface 11 a, a first accommodating hole 11 b that isformed on the bottom surface 11 a side, and a second accommodating hole11 c that is formed so as to be continuous with the first accommodatinghole 11 b and that has the inner diameter larger than that of the firstaccommodating hole 11 b.

In addition, the pump housing 10 is provided with a cut-out portion 11 dthat is formed by being cut out radially outward from an innercircumferential surface of the second accommodating hole 11 c, arecessed high-pressure chamber 32 that is formed in the bottom surface11 a, and a discharge passage 33 that communicates with thehigh-pressure chamber 32 and opens at the attachment surface 10 a.

The cut-out portion 11 d is provided so as to face a tank passage (notshown) that opens at the attachment surface 52 a of the housing 52 ofthe driving source 50, and the discharge passage 33 is provided so as toface a working-oil-supply passage (not shown) that opens at theattachment surface 52 a of the housing 52 of the driving source 50.Here, the tank passage, which is provided in the housing 52 of thedriving source 50, communicates with a tank (not shown) for storingworking oil, and the working-oil-supply passage communicates with thefluid hydraulic apparatus that is driven by the working oil.

The pump cartridge 20 has: a driven shaft 1 that is rotationally drivenby the driving source 50; a rotor 24 to which a rotational driving forcefrom the driving source 50 is transmitted via the driven shaft 1; aplurality of vanes 25 that are respectively and freely slidably receivedin a plurality of slits formed radially in the rotor 24; and a cam ring26 formed with a cam face 26 a on an inner circumference of the cam ring26 along which tip ends of the vanes 25 slide as the rotor 24 isrotated. In the cam ring 26, a plurality of pump chambers 27 are definedby an outer circumferential surface of the rotor 24, the cam face 26 aof the cam ring 26, and adjacent vanes 25.

The driven shaft 1 is a shaft-like member having an engagement portion 1a that engages with the rotor 24 and a linkage portion 1 b that isprovided so as to be projected towards the driving source 50 from thepump cartridge 20. An outer circumferential surface of the engagementportion la is subjected to the spline processing, and the linkageportion 1 b is linked to a drive shaft 51 of the driving source 50 via ajoint member 54, such as an Oldham's coupling, etc.

The rotor 24 is an annular member and is formed with, at the centerportion thereof, an engagement hole 24 a for the engagement with theengagement portion la of the driven shaft 1 such that the engagementhole 24 a penetrates through the rotor 24 in the axial directionthereof. An inner circumferential surface of the engagement hole 24 a issubjected to the spline processing. In addition, a plurality of slits(not shown), which are formed radially, open at the outercircumferential surface of the rotor 24, and the vanes 25 arerespectively received in the slits in a freely slidable manner.

The cam ring 26 is an annular member having the substantiallyoval-shaped cam face 26 a that is formed on the inner circumferentialsurface thereof. The cam face 26 a has two suction regions where volumesof the pump chambers 27 are expanded along with the rotation of therotor 24 and two discharge regions where volumes of the pump chambers 27are contracted along with the rotation of the rotor 24.

The pump cartridge 20 further has a first side plate 29 that is providedon the opposite side from the bottom surface 11 a of the accommodatingconcave portion 11 such that the cam ring 26 is located therebetween anda second side plate 28 that is provided between the cam ring 26 and thebottom surface 11 a of the accommodating concave portion 11.

As shown in FIG. 2, the first side plate 29 is an annular member havingtwo arc-shaped suction ports 29 a that are formed by being cutting out.The suction ports 29 a are provided so as to correspond to the suctionregions of the cam ring 26 and to guide the working oil to the pumpchambers 27.

The second side plate 28 is a disc member that is formed with twoarc-shaped through holes each serving as a discharge port 28 a. Thedischarge ports 28 a are provided so as to correspond to the dischargeregions of the cam ring 26 and so as to guide the working oil that hasbeen discharged from the pump chambers 27 to the high-pressure chamber32. A guide suction ports for guiding the working oil to the pumpchambers 27 may be provided not only in the first side plate 29, butalso in the second side plate 28 or the cam ring 26.

In addition, the pump cartridge 20 has two linkage pins 30 that areinserted through the cam ring 26, the first side plate 29, and thesecond side plate 28. Because relative rotation between the cam ring 26,the first side plate 29, and the second side plate 28 is restricted bythe two linkage pins 30, the suction regions of the cam ring 26 and thesuction ports 29 a of the first side plate 29 are aligned, and thedischarge regions of the cam ring 26 and the discharge ports 28 a of thesecond side plate 28 are aligned.

The pump cartridge 20 that is made into a unit by the linkage pins 30 isaccommodated in the accommodating concave portion 11 in the pump housing10 that is formed as described above.

Specifically, a part of the second side plate 28 is inserted into thefirst accommodating hole 11 b of the accommodating concave portion 11,and the high-pressure chamber 32 is defined by the second side plate 28.In addition, a space having a predetermined volume, serving as a suctionpressure chamber 31, is formed between the second accommodating hole 11c and the cam ring 26 and the first side plate 29 that are inserted intothe second accommodating hole 11 c of the accommodating concave portion11.

As described above, the vane pump 100 in which the pump cartridge 20 isaccommodated in the accommodating concave portion 11 of the pump housing10 is assembled to the driving source 50 by fixing the pump housing 10to the housing 52 of the driving source 50 with a plurality of bolts(not shown).

As described above, in a state in which the pump cartridge 20 is simplyaccommodated in the accommodating concave portion 11 of the pump housing10, there is a concern that the pump cartridge 20 may be detached fromthe pump housing 10 while the vane pump 100 is being transported orwhile the vane pump 100 is being assembled to the driving source 50.

In order to prevent the pump cartridge 20 from being detached from thepump housing 10, it is conceivable to assemble an anti-detachmentmember, such as a cover plate, etc., covering the pump cartridge 20 tothe pump housing 10. However, such the anti-detachment member needs tobe disassembled from the pump housing 10 when the vane pump 100 is to beassembled to the driving source 50. In other words, when theanti-detachment member is provided, because the number of man-hours isincreased due to the needs of steps of assembling and disassembling theanti-detachment member, and therefore, there is a concern, as a result,that a manufacturing cost of an apparatus having the vane pump 100 isincreased.

In addition, in the pump housing 10, if the pump cartridge 20 can berotated about the driven shaft 1 in the accommodating concave portion11, there is a concern that a discharge pressure becomes unstable and apump efficiency is deteriorated. Therefore, in a state in which the vanepump 100 is assembled to the driving source 50, it is required to fixthe pump cartridge 20 with respect to the pump housing 10 so as not tobe rotatable about the driven shaft 1 in the accommodating concaveportion 11.

In order to restrict the rotation of the pump cartridge 20, it isconceivable to insert end portions of the linkage pins 30 into holesformed in the bottom surface 11 a of the pump housing 10 or holes formedin the housing 52 of the driving source 50. However, in either case, itis difficult to see positions of the linkage pins 30 and the holes whenthe linkage pins 30 are to be inserted into the holes. Thus, it isdifficult to smoothly insert the linkage pins 30 into the holes, andtherefore, a deterioration of efficiency of an assembly operation iscaused. Furthermore, the pump housing 10 and the housing 52 of thedriving source 50 needs to be formed with the holes into which thelinkage pins 30 are to be inserted with high accuracy. Therefore, if therotation of the pump cartridge 20 is restricted by such a way, there isa concern that the manufacturing cost of the apparatus having the vanepump 100 is increased.

Thus, in this embodiment, by providing a configuration in which the pumpcartridge 20 is anchored to the pump housing 10, the pump cartridge 20is prevented from being detached from the pump housing 10 without theneed of assembly/disassembly of the anti-detachment member, etc.Furthermore, in this embodiment, by providing an anti-rotation devicefor the pump cartridge 20 at the position that can be seen, the rotationof the pump cartridge 20 is restricted, and at the same time, theassemblability of the pump cartridge 20 to the pump housing 10 isimproved.

In the following, the configuration in which the pump cartridge 20 isanchored to the pump housing 10 will be described.

In order to anchor the pump cartridge 20 to the pump housing 10, thevane pump 100 is further provided with a snap ring 40 serving as anannular member that is fitted into an annular groove 1 le formed in theinner circumferential surface of the second accommodating hole 11 c ofthe accommodating concave portion 11.

In addition, arc-shaped first projected portions 29 b are provided onthe above-described first side plate 29 so as to project radiallyoutward from an outer circumferential surface at two positions such thatthe driven shaft 1 is located therebetween. The outer diameter at anouter circumferential surface of the first projected portion 29 b is setso as to be smaller than the inner diameter of the second accommodatinghole 11 c. Therefore, the pump cartridge 20 having the first projectedportions 29 b projecting radially outward is accommodated in theaccommodating concave portion 11.

By fitting the snap ring 40 into the annular groove 1 le in a state inwhich the pump cartridge 20 is accommodated in the accommodating concaveportion 11 of the pump housing 10, the snap ring 40 comes into contactwith the first projected portions 29 b at the opposite side from thebottom surface 11 a.

As described above, because the first projected portions 29 b of thefirst side plate 29 are anchored by the snap ring 40 that is fitted intothe annular groove 11 e formed in the pump housing 10, the pumpcartridge 20 is prevented from being detached from the pump housing 10.

Therefore, there is no need to attach/detach the anti-detachment memberto/from the pump housing 10 in order to prevent the pump cartridge 20from being detached from the pump housing 10, and therefore, it ispossible to improve the assemblability of the vane pump 100 to thedriving source 50.

Next, a configuration for restricting the rotation of the pump cartridge20 will be described.

As shown in FIGS. 2 and 3, the above-described second side plate 28 isprovided with a second projected portion 28 b so as to project radiallyoutward from an outer circumferential surface of the second side plate28. On the other hand, an inner circumferential surface of the firstaccommodating hole 11 b, into which the second side plate 28 isinserted, is provided with an axial groove 11 f serving as a firstengagement groove, to which the second projected portion 28 b isengaged, so as to extend along the axial direction of the driven shaft1.

By inserting the pump cartridge 20 into the accommodating concaveportion 11 of the pump housing 10 such that the second projected portion28 b is engaged with the axial groove 11 f formed in the pump housing10, the rotation of the pump cartridge 20 about the driven shaft 1 inthe accommodating concave portion 11 is restricted by the secondprojected portion 28 b that is brought into contact with the axialgroove 11 f. As described above, by providing the pump cartridge 20 soas not to be rotatable in the accommodating concave portion 11, it ispossible to stabilize the discharge pressure of the vane pump 100 and toimprove the pump efficiency of the vane pump 100.

In addition, the axial groove 11 f is formed such that one end thereofopens in the cut-out portion 11 d that is formed by being cut outradially outward from the inner circumferential surface of the secondaccommodating hole 11 c. Therefore, it is possible to insert the pumpcartridge 20 into the accommodating concave portion 11 of the pumphousing 10 while visually observing a situation in which the secondprojected portion 28 b is being engaged with the axial groove 11 f.

As described above, the restriction of the rotation of the pumpcartridge 20 is achieved with the configuration of a part with which acheck is easily performed while the assembly of the pump cartridge 20 tothe pump housing 10, and thereby, even if the configuration in which therotation of the pump cartridge 20 is restricted is provided, it is stillpossible to improve the assemblability of the pump cartridge 20 to thepump housing 10.

The position to provide the axial groove 11 f is not limited to theregion in which the cut-out portion 11 d is formed, and the axial groove11 f may be provided at any position in the inner circumferentialsurface of the first accommodating hole 11 b as long as it is easy torecognize the situation while the pump cartridge 20 is being insertedinto the accommodating concave portion 11 of the pump housing 10. Inaddition, in this case, in order to avoid an interference with thesecond accommodating hole 11 c, the outer diameter at an outercircumferential surface of the second projected portion 28 b is set soas to be smaller than the inner diameter of the second accommodatinghole 11 c.

Next, an operation of the vane pump 100 having the above-describedconfiguration will be described.

The vane pump 100 assembled to the driving source 50 discharges theworking oil by being rotationally driven by the driving source 50.Specifically, rotation of the drive shaft 51 of the driving source 50 istransmitted to the driven shaft 1 via the joint member 54, and the rotor24 engaged with the driven shaft 1 is then rotationally driven. As therotor 24 is rotationally driven, each of the pump chambers 27 isexpanded/contracted in accordance with the profile of the cam face 26 a.

The pump chamber 27 being expanded sucks the working oil stored in thetank through the tank passage that is formed in the housing 52 of thedriving source 50, the cut-out portion 11 d that communicates with thetank passage, the suction pressure chamber 31 that communicates with thecut-out portion 11 d, and the suction ports 29 a that communicates withthe suction pressure chamber 31.

On the other hand, the pump chamber 27 being contracted supplies thepressurized working oil to the fluid hydraulic apparatus through thedischarge port 28 a that is formed in the second side plate 28, thehigh-pressure chamber 32 that communicates with the discharge ports 28a, the discharge passage 33 that communicates with the high-pressurechamber 32, and the working-oil-supply passage that is formed in thehousing 52 of the driving source 50 and that communicates with thedischarge passage 33. As described above, the vane pump 100 sucks theworking oil from the driving source 50 side and discharges the workingoil to the driving source 50 side.

According to the first embodiment described above, the advantagesdescribed below are afforded.

In the vane pump 100, the pump cartridge 20 is anchored to the pumphousing 10 via the first projected portions 29 b provided on the firstside plate 29, and thereby, the pump cartridge 20 is held within theaccommodating concave portion 11. Therefore, it is possible to preventthe pump cartridge 20 from being detached from the pump housing 10 whilethe vane pump 100 is assembled to the driving source 50 and to assemblethe vane pump 100 to the driving source 50 without performing any extrasteps. As described above, the member for preventing detachment is nolonger required to be assembled/disassembled, and as a result, it ispossible to reduce the manufacturing cost of the apparatus having thevane pump 100.

In addition, in the vane pump 100, because the second projected portion28 b provided on the second side plate 28 is engaged with the axialgroove 11 f formed in the pump housing 10, the rotation of the pumpcartridge 20 about the driven shaft 1 in the accommodating concaveportion 11 is restricted. As described above, by providing the pumpcartridge 20 so as not to be rotatable in the accommodating concaveportion 11, it is possible to stabilize the discharge pressure of thevane pump 100 and to improve the pump efficiency of the vane pump 100.In addition, the restriction of the rotation of the pump cartridge 20 isachieved with the configuration of the part with which the check iseasily performed while the assembly of the pump cartridge 20 to the pumphousing 10, and thereby, even if the configuration in which the rotationof the pump cartridge 20 is restricted is provided, it is possible toimprove the assemblability of the pump cartridge 20 to the pump housing10.

Second Embodiment

Next, a vane pump 200 according to a second embodiment of the presentinvention will be described with reference to FIGS. 4 to 6. In thefollowing description, differences from the above-described firstembodiment will be mainly described, and components that are the same asthose in the vane pump 100 according to the above-described firstembodiment are assigned the same reference numerals and descriptionsthereof will be omitted. FIG. 4 is a sectional view of the vane pump 200according to the second embodiment of the present invention, FIG. 5 is asectional view showing a cross-section taken along a line V-V in FIG. 4,and FIG. 6 is an enlarged sectional view showing a cross-section, inenlargement, taken along a line VI-VI in FIG. 5.

A basic configuration of the vane pump 200 is similar to that of thevane pump 100 according to the above-described first embodiment. Incontrast to the vane pump 100 according to the above-described firstembodiment in which the pump cartridge 20 is anchored to the pumphousing 10 via the snap ring 40, the vane pump 200 mainly differs fromthe vane pump 100 in that the pump cartridge 20 is anchored to the pumphousing 10 directly.

Similarly to the vane pump 100 according to the above-described firstembodiment, the vane pump 200 is provided with the pump housing 10having the accommodating concave portion 11 and the pump cartridge 20that is accommodated in the accommodating concave portion 11.

The pump cartridge 20 has a first side plate 129 that is provided on theopposite side from the bottom surface 11 a of the accommodating concaveportion 11 such that the cam ring 26 is located therebetween, and thefirst side plate 129 is provided with two suction ports 129 a andarc-shaped first projected portions 129 b that project radially outwardfrom an outer circumferential surface of the first side plate 129.

The first projected portions 129 b are provided at two positions suchthat the driven shaft 1 is located therebetween, and the outer diameterat an outer circumferential surface of the first projected portion 129 bis set so as to be larger than the inner diameter of the secondaccommodating hole 11 c.

On the other hand, axial grooves 11 g and circumferential directiongrooves 11 h serving as second engagement grooves with which the firstprojected portions 129 b are engaged are formed in the innercircumferential surface of the second accommodating hole 11 c of theaccommodating concave portion 11 of the pump housing 10.

The axial grooves 11 g are each a groove that is formed so as to extendalong the axial direction of the driven shaft 1, and the circumferentialdirection grooves 11 h are each a groove that is formed so as to extendalong the circumferential direction from an end portion of the axialgroove 11 g towards the rotation direction of the vane pump 200 shown byan arrow A in FIG. 5.

As shown in FIG. 6, a width GW1 of the axial groove 11 g in thecircumferential direction is set so as to be longer than a width W1 ofthe first projected portion 129 b in the circumferential direction, anda width GW2 of the circumferential direction groove 11 h in the axialdirection is set so as to have a portion that is slightly smaller than awidth W2 of the first projected portion 129 b in the axial direction.Specifically, the width GW2 of the circumferential direction groove 11 hin the axial direction is set so as to become gradually narrower in thedirection away from the axial groove 11 g and so as to have the sizethat is substantially large enough to fit the first projected portion129 b.

In the vane pump 200 having the above described configuration, the firstprojected portions 129 b are respectively inserted to the axial grooves11 g from the attachment surface 10 a side along the axial direction,and the pump cartridge 20 is rotated in the rotation direction of thevane pump 200 about the driven shaft 1. Subsequently, the firstprojected portions 129 b are caused to engage at least partially withthe circumferential direction grooves 11 h, and thereby, it is possibleto anchor the pump cartridge 20 to the pump housing 10 directly.

As described above, by respectively fitting the first projected portions129 b of the first side plate 129 to the circumferential directiongrooves 11 h formed in the pump housing 10, it is possible to preventthe pump cartridge 20 from being detached from the pump housing 10.

In addition, by respectively fitting the first projected portions 129 bto the circumferential direction grooves 11 h formed in the pump housing10, the movement of the pump cartridge 20 in the accommodating concaveportion 11 is restricted, and at the same time, the movement of the pumpcartridge 20 in the direction in which the vane pump 200 is rotationallydriven is also inhibited by an end surface of the circumferentialdirection grooves 11 h. As described above, by providing the pumpcartridge 20 so as not to be rotatable about the driven shaft 1 in theaccommodating concave portion 11, it is possible to stabilize thedischarge pressure of the vane pump 200 and to improve the pumpefficiency of the vane pump 200.

In addition, after the first projected portions 129 b are respectivelyfitted into the circumferential direction grooves 11 h, retainer pins 41to be inserted into the pump housing 10 may be each provided at theposition opposite side from the circumferential direction groove 11 hsuch that the first projected portion 129 b is located therebetween. Asdescribed above, by arranging the retainer pin 41 in the direction inwhich the first projected portion 129 b moves out from thecircumferential direction groove 11 h, it is possible to restrict therotation of the pump cartridge 20 about the driven shaft 1 with highreliability.

In addition, as shown in FIG. 5, the axial grooves 11 g are each formedsuch that one end thereof opens at the attachment surface 10 a.Therefore, it is possible to insert the pump cartridge 20 into theaccommodating concave portion 11 of the pump housing 10 while visuallyobserving the situation at which the first projected portions 129 b arerespectively engaged with the axial grooves 11 g and the circumferentialdirection grooves 11 h.

As described above, the anchoring of the pump cartridge 20 to the pumphousing 10 and the restriction of the rotation of the pump cartridge 20are achieved with the configuration of the part with which the check iseasily performed while the assembly of the pump cartridge 20 to the pumphousing 10, and thereby, it is possible to improve the assemblability ofthe pump cartridge 20 to the pump housing 10.

Because the operation of the vane pump 200 having the above describedconfiguration is the same as the operation of the vane pump 100according to the above-described first embodiment, detailed descriptionsthereof will be omitted.

According to the second embodiment, the advantages described below areafforded.

In the vane pump 200, because the pump cartridge 20 is anchored to thepump housing 10 via the first projected portions 129 b provided on thefirst side plate 129, the pump cartridge 20 is held in the accommodatingconcave portion 11. Therefore, it is possible to prevent the pumpcartridge 20 from being detached from the pump housing 10 while the vanepump 200 is assembled to the driving source 50 and to assemble the vanepump 200 to the driving source 50 without performing any extra steps. Asdescribed above, the member for preventing detachment is no longerrequired to be assembled/disassembled, and as a result, it is possibleto reduce the manufacturing cost of the apparatus having the vane pump200.

In addition, in the vane pump 200, because the first projected portions129 b provided on the first side plate 129 are engaged with thecircumferential direction grooves 11 h formed in the pump housing 10,the rotation of the pump cartridge 20 about the driven shaft 1 in theaccommodating concave portion 11 is restricted. As described above, byproviding the pump cartridge 20 so as not to be rotatable in theaccommodating concave portion 11, it is possible to stabilize thedischarge pressure of the vane pump 200 and to improve the pumpefficiency of the vane pump 200.

In addition, in the vane pump 200, by only engaging the first projectedportions 129 b provided on the first side plate 129 with thecircumferential direction grooves 11 h formed in the pump housing 10,the pump cartridge 20 is anchored to the pump housing 10 and therotation of the pump cartridge 20 in the accommodating concave portion11 is restricted. As described above, in the vane pump 200, it ispossible to prevent the pump cartridge 20 from being detached from thepump housing 10 by a simple configuration and to improve the pumpefficiency by stabilizing the discharge pressure of the vane pump 200.

Next, a modification of the respective embodiments described above willbe described.

In the respective embodiment described above, the pump cartridge 20 hasthe driven shaft 1 that is linked to the drive shaft 51 of the drivingsource 50. Instead of this configuration, as shown in FIG. 7, the pumpcartridge 20 may not have the driven shaft 1. In this case, anengagement portion 51 a that is formed at a tip end of the drive shaft51 of the driving source 50 is engaged with the engagement hole 24 a ofthe rotor 24 directly. In addition, in this case, because a through holethrough which the driven shaft 1 is to be inserted is not provided inthe second side plate 28, it is possible to simplify the shapes of thesecond side plate 28 and the high-pressure chamber 32.

FIG. 7 shows a configuration in which the drive shaft 51 of the drivingsource 50 is directly engaged with the engagement hole 24 a of the rotor24 in the above-described first embodiment. Similarly, also in theabove-described second embodiment, it is possible to directly engage thedrive shaft 51 of the driving source 50 with the engagement hole 24 a ofthe rotor 24.

In addition, although the two first projected portions 29 b are providedin the above-described first embodiment, the number of the firstprojected portions 29 b is not limited to two, and three or more firstprojected portions 29 b may be provided. Similarly, although the twofirst projected portions 129 b are provided in the above-describedsecond embodiment, the number of the first projected portions 129 b isnot limited to two, and three or more first projected portions 129 b maybe provided.

In addition, although the first projected portion 29 b is formed to havethe arc shape in the above-described first embodiment, the shape of thefirst projected portion 29 b is not limited thereto, and the firstprojected portion 29 b may have any shape as long as the first projectedportion 29 b has a shape in which the first projected portion 29 bprojects radially outward from the outer circumferential surface of thefirst side plate 29 so as to be able to come into contact with the snapring 40. Similarly, although the first projected portion 129 b is formedto have the arc shape in the above-described second embodiment, theshape of the first projected portion 129 b is not limited thereto, andthe first projected portion 129 b may have any shape as long as thefirst projected portion 129 b has a shape in which the first projectedportion 129 b projects radially outward from the outer circumferentialsurface of the first side plate 129 so as to be able to be anchored tothe circumferential direction groove 11 h.

The configurations, operations, and effects of the embodiments of thepresent invention configured as described above will be collectivelydescribed.

The vane pump 100, 200 includes: the pump housing 10 having theaccommodating concave portion 11; and the pump cartridge 20 accommodatedin the accommodating concave portion 11, wherein the pump cartridge 20has: the rotor 24 to which the rotational driving force from the drivingsource 50 is transmitted; the plurality of vanes 25 freely slidablyreceived in the plurality of slit, the slits being formed in the rotor24 in a radiating pattern; the cam ring 26 formed with the cam face 26 aon an inner circumference of the cam ring 26, the cam face 26 a beingconfigured such that the tip ends of the plurality of vanes 25 slide onthe cam face 26 a as the rotor 24 is rotated; and the first side plate29, 129 provided on the opposite side from the bottom surface 11 a ofthe accommodating concave portion 11 such that the cam ring 26 islocated therebetween, the first side plate 29, 129 has the firstprojected portions 29 b, 129 b projected radially outward, and the pumpcartridge 20 is anchored to the pump housing 10 via the first projectedportions 29 b, 129 b.

In this configuration, because the pump cartridge 20 is anchored to thepump housing 10 via the first projected portions 29 b, 129 b provided onthe first side plate 29, 129, the pump cartridge 20 is held in theaccommodating concave portion 11. Therefore, it is possible to preventthe pump cartridge 20 from being detached from the pump housing 10 whilethe vane pump 100, 200 is assembled to the driving source 50 and toassemble the vane pump 100, 200 to the driving source 50 withoutperforming any extra steps. As described above, the member forpreventing detachment is no longer required to be assembled/disassembledto/from the pump housing 10, and as a result, it is possible to reducethe manufacturing cost of the apparatus having the vane pump 100, 200.

In addition, the vane pump 100 further includes: the snap ring 40 fittedinto the annular groove 11 e, the annular groove 11 e being formed inthe inner circumferential surface of the accommodating concave portion11, wherein the snap ring 40 comes into contact with the first projectedportion 29 b at the opposite side from the bottom surface 11 a of theaccommodating concave portion 11.

In this configuration, the pump cartridge 20 is held in theaccommodating concave portion 11 as the snap ring 40 fitted into thepump housing 10 comes into contact with the first projected portions 29b. As described above, with the simple configuration, it is possible toprevent the pump cartridge 20 from being detached from the pump housing10 while the vane pump 100 is assembled to the driving source 50 and toassemble the vane pump 100 to the driving source 50 without performingany extra steps. Therefore, the member for preventing detachment is nolonger required to be assembled/disassembled to/from the pump housing10, and as a result, it is possible to reduce the manufacturing cost ofthe apparatus having the vane pump 100.

In addition, the pump cartridge 20 further has: the second side plate 28provided on the opposite side from the first side plate 29 such that thecam ring 26 is located therebetween; and the linkage pins 30 configuredto link the cam ring 26, the first side plate 29, and the second sideplate 28, the second side plate 28 has the second projected portion 28 bprojected radially outward, and the axial groove 11 f is provided in theinner circumferential surface of the accommodating concave portion 11 soas to extend along the axial direction, the axial groove 11 f beingconfigured to engage with the second projected portion 28 b.

In this configuration, because the second projected portion 28 bprovided in the second side plate 28 is engaged with the axial groove 11f formed in the pump housing 10, the rotation of the pump cartridge 20about the driven shaft 1 in the accommodating concave portion 11 isrestricted. As described above, by providing the pump cartridge 20 so asnot to be rotatable in the accommodating concave portion 11, it ispossible to stabilize the discharge pressure of the vane pump 100 and toimprove the pump efficiency of the vane pump 100. In addition, therestriction of the rotation of the pump cartridge 20 is achieved withthe configuration of the part with which the check is easily performedwhile the assembly of the pump cartridge 20 to the pump housing 10, andthereby, even if the configuration in which the rotation of the pumpcartridge 20 is restricted is provided, it is possible to improve theassemblability of the pump cartridge 20 to the pump housing 10.

In addition, the second engagement grooves 11 g, 11 h is provided in theinner circumferential surface of the accommodating concave portion 11,the second engagement grooves 11 g, 11 h being configured to engage withthe first projected portion 129 b, the second engagement groove has theaxial groove 11 g and the circumferential direction groove 11 h, theaxial groove 11 g being provided so as to extend along the axialdirection, and the circumferential direction groove 11 h beingconfigured so as to be connected to the axial groove 11 g and to extendin the circumferential direction, and in a state in which at least apart of the first projected portion 129 b is engaged with thecircumferential direction groove 11 h, the pump cartridge 20 is anchoredto the pump housing 10.

In this configuration, because the first projected portions 129 b isengaged with the circumferential direction grooves 11 h formed in thepump housing 10, the pump cartridge 20 is held in the accommodatingconcave portion 11. As described above, with the simple configuration,it is possible to prevent the pump cartridge 20 from being detached fromthe pump housing 10 while the vane pump 200 is assembled to the drivingsource 50 and to assemble the vane pump 200 to the driving source 50without performing any extra steps. Therefore, the member for preventingdetachment is no longer required to be assembled/disassembled to/fromthe pump housing 10, and as a result, it is possible to reduce themanufacturing cost of the apparatus having the vane pump 200.

In addition, in this configuration, because the first projected portions129 b provided in the first side plate 129 is engaged with thecircumferential direction grooves 11 h formed in the pump housing 10,the rotation of the pump cartridge 20 about the driven shaft 1 in theaccommodating concave portion 11 is restricted. As described above, byproviding the pump cartridge 20 so as not to be rotatable in theaccommodating concave portion 11, it is possible to stabilize thedischarge pressure of the vane pump 200 and to improve the pumpefficiency of the vane pump 200.

Embodiments of the present invention were described above, but the aboveembodiments are merely examples of applications of the presentinvention, and the technical scope of the present invention is notlimited to the specific constitutions of the above embodiments.

This application claims priority based on Japanese Patent ApplicationNo. 2019-69819 filed with the Japan Patent Office on Apr. 1, 2019, theentire contents of which are incorporated into this specification byreference.

1. A vane pump configured to discharge working fluid by beingrotationally driven by a driving source, comprising: a pump housinghaving an accommodating concave portion; and a pump cartridgeaccommodated in the accommodating concave portion, wherein the pumpcartridge has: a rotor to which a rotational driving force from thedriving source is transmitted; a plurality of vanes freely slidablyreceived in a plurality of slits, the slits being formed in the rotor ina radiating pattern; a cam ring formed with a cam face on an innercircumference of the cam ring, the cam face being configured such thattip ends of the plurality of vanes slide on the cam face as the rotor isrotated; and a first side plate provided on an opposite side from abottom surface of the accommodating concave portion such that the camring is located therebetween, the first side plate has a first projectedportion projected radially outward, and the pump cartridge is anchoredto the pump housing via the first projected portion.
 2. The vane pumpaccording to claim 1, further comprising an annular member fitted intoan annular groove, the annular groove being formed in an innercircumferential surface of the accommodating concave portion, whereinthe annular member comes into contact with the first projected portionat an opposite side from the bottom surface of the accommodating concaveportion.
 3. The vane pump according to claim 2, wherein the pumpcartridge further has: a second side plate provided on an opposite sidefrom the first side plate such that the cam ring is locatedtherebetween; and a linkage pin configured to link the cam ring, thefirst side plate, and the second side plate, the second side plate has asecond projected portion projected radially outward, and a firstengagement groove is provided in the inner circumferential surface ofthe accommodating concave portion so as to extend along an axialdirection, the first engagement groove being configured to engage withthe second projected portion.
 4. The vane pump according to claim 1,wherein a second engagement groove is provided in the innercircumferential surface of the accommodating concave portion, the secondengagement groove being configured to engage with the first projectedportion, the second engagement groove has an axial groove and acircumferential direction groove, the axial groove being provided so asto extend along an axial direction, and the circumferential directiongroove being configured so as to be connected to the axial groove and toextend in a circumferential direction, and in a state in which at leasta part of the first projected portion is engaged with thecircumferential direction groove, the pump cartridge is anchored to thepump housing.